What is Minecraft Forge API 1.12?
Minecraft Forge is a modding API (Application Programming Interface), which makes it easier to create mods, and also make sure mods are compatible with each other.

The method that you are trying to use, by deleting META-INF and placing the files is not the way to install mods anymore. The new Minecraft launcher prevents modification of the actual game files, because it simply re-downloads them if they have changed.

Instead, you can create a new ‘profile’ in the Minecraft launcher containing the modified game file, preventing the launcher from refreshing the files. Forge actually comes with an automatic installer, which does this for you.

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